Sprintax does not keep records longer than 3 years and you cannot download your forms prepared before 2020. If you wish to get a copy of your returns, please request a transcript on the tax office website here - https://www.irs.gov/individuals/get-transcript
For the State tax return copies, you can type on Google 'get transcript' + the name of the state you filed for and you should be redirected to the exact page.
Keep in mind that it is always best to have a copy of the filed tax returns saved on your computer or printed and stored in a folder exactly for cases like this.